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The number of airplanes equipped with a new anticollision

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The number of airplanes equipped with a new anticollision [#permalink] New post 24 Sep 2012, 00:49
00:00
A
B
C
D
E

Difficulty:

  25% (low)

Question Stats:

85% (01:50) correct 14% (01:39) wrong based on 41 sessions
The number of airplanes equipped with a new anticollision device has increased steadily during the past two years. During the same period, it has become increasingly common for key information about an airplane’s altitude and speed to disappear suddenly from air traffic controllers’ screens. The new anticollision device, which operates at the same frequency as air traffic radar, is therefore responsible for the sudden disappearance of key information. Which one of the following, if true, most seriously weakens the argument?

(A) The new anticollision device has already prevented a considerable number of mid-air collisions.
(B) It was not until the new anticollision device was introduced that key information first began disappearing suddenly from controllers’ screens.
(C) The new anticollision device is scheduled to be moved to a different frequency within the next two to three months.
(D) Key information began disappearing from controllers’ screens three months before the new anticollision device
was first tested.
(E) The sudden disappearance of key information from controllers’ screens has occurred only at relatively large airports.
[Reveal] Spoiler: OA

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Last edited by getgyan on 24 Sep 2012, 03:18, edited 1 time in total.
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Re: The number of airplanes equipped with [#permalink] New post 24 Sep 2012, 00:54
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IMO D, as that is the only one related to the stimulus
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Re: The number of airplanes equipped with [#permalink] New post 24 Sep 2012, 03:15
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getgyan wrote:
The number of airplanes equipped with a new anticollision device has increased steadily during the past two years. During the same period, it has become increasingly common for key information about an airplane’s altitude and speed to disappear suddenly from air traffic controllers’ screens. The new anticollision device, which operates at the same frequency as air traffic radar, is therefore responsible for the sudden disappearance of key information. Which one of the following, if true, most seriously weakens the argument?

(A) The new anticollision device has already prevented a considerable number of mid-air collisions.
(B) It was not until the new anticollision device was introduced that key information first began disappearing suddenly from controllers’ screens.
(C) The new anticollision device is scheduled to be moved to a different frequency within the next two to three months.
(D) Key information began disappearing from controllers’ screens three months before the new anticollision device
was first tested.
(E) The sudden disappearance of key information from controllers’ screens has occurred only at relatively large airports.


A- Out of scope
B- strenghtens
c-Again its an extra premise
D- If this is true then the argument is in serious jeopardy.
E- Again this is irrelevant.

So D is my answer.
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GPA: 3.5
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Re: The number of airplanes equipped with [#permalink] New post 24 Sep 2012, 03:17
+1 D

It is a “Weaken” type question

Premise - The number of airplanes equipped with a new anti-collision device has increased steadily during the past two years. During the same period, it has become increasingly common for key information about an airplane’s altitude and speed to disappear suddenly from air traffic controllers’ screens

Conclusion - The new anti-collision device, which operates at the same frequency as air traffic radar, is therefore responsible for the sudden disappearance of key information.

Anything which weakens the conclusion is our answer

(A) The new anti-collision device has already prevented a considerable number of mid-air collisions. (Not related to disappearance of key information, eliminate)
(B) It was not until the new anti-collision device was introduced that key information first began disappearing suddenly from controllers’ screens. (Exactly opposite, it strengthen the argument, eliminate)
(C) The new anti-collision device is scheduled to be moved to a different frequency within the next two to three months. (We do not know that frequency is the reason for disappearance of information)
(D) Key information began disappearing from controllers’ screens three months before the new anti-collision device was first tested. (This is our answer. It shows that the disappearance is not because of new anti-collision device, thus weakening the conclusion)
(E) The sudden disappearance of key information from controllers’ screens has occurred only at relatively large airports. (Irrelevant, eliminate)

:-D
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Re: The number of airplanes equipped with a new anticollision [#permalink] New post 24 Oct 2012, 22:46
I got D as the answer
But the wordings of B is bit confusing can someone help me out in understanding B
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Re: The number of airplanes equipped with a new anticollision [#permalink] New post 25 Oct 2012, 00:26
getgyan wrote:
The number of airplanes equipped with a new anticollision device has increased steadily during the past two years. During the same period, it has become increasingly common for key information about an airplane’s altitude and speed to disappear suddenly from air traffic controllers’ screens. The new anticollision device, which operates at the same frequency as air traffic radar, is therefore responsible for the sudden disappearance of key information. Which one of the following, if true, most seriously weakens the argument?

(A) The new anticollision device has already prevented a considerable number of mid-air collisions.
(B) It was not until the new anticollision device was introduced that key information first began disappearing suddenly from controllers’ screens.
(C) The new anticollision device is scheduled to be moved to a different frequency within the next two to three months.
(D) Key information began disappearing from controllers’ screens three months before the new anticollision device
was first tested.
(E) The sudden disappearance of key information from controllers’ screens has occurred only at relatively large airports.


Yup D it is..

Archit.it is saying after new devise was introduce disappearing apears..that means. it was not untill means before intoduing new device it was not disapearning kind of thing apread ..
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Re: The number of airplanes equipped with a new anticollision   [#permalink] 25 Oct 2012, 00:26
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